Download Chemical Thermodynamics of Americium by Robert J. Silva PDF

By Robert J. Silva

This is often the second one quantity in a chain of severe studies of the chemical thermodynamic facts of these components of specific significance within the defense evaluation modeling of high-level radioactive waste garage and disposal amenities. the target of those experiences is to supply a collection of trustworthy thermodynamic info that may be used to explain the behaviour of those components lower than stipulations proper for radioactive waste disposal structures and the geochemical environments. the current quantity is a evaluate of experimental info pronounced within the literature for americium. On a number of events, the place no facts existed, comparisons and estimates have been made according to experimental info on analog lanthanide parts. the elemental philosophy used to be to increase a minimal set of reliable stages and resolution species of americium that will healthy all experimental information being reviewed

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L : Selected thermodynamic data for americium compounds and complexes. All ionic species listed in this table are aqueous species. 1 MPa and, for aqueous species, infinite dilution (7 = 0). The uncertainties listed below each value represent total uncertainties and correspond in principle to the statistically defined 95% confidence interval. Values obtained from internal calculation, cf. footnotes (a) and (b), are rounded at the third digit after the decimal point and may therefore not be exactly identical to those given in Chapter V.

T h e later approach would imply a twofold propagation of the uncertainties and result in reaction d a t a whose uncertainties would be considerably larger t h a n those originally assigned. 00°C), but they can be recalculated to other temperatures if the corresponding d a t a (enthalpies, entropies, heat capacities) are available [93PUI/RAR]. 15 K), and of the heat capacity function is: 0 A G° (T) r m = A H° (T ) r m 0 + J T and the t e m p e r a t u r e dependence of the standard equilibrium constant as a function of the standard reaction enthalpy and heat capacity is: where R is the gas constant (cf.

2. The application of the standard state principle to pure substances and mixtures is summarised below. 3. • T h e s t a n d a r d state for a gaseous substance, whether pure or in a gaseous mix­ ture, is the pure substance at the standard state pressure and in a (hypothetical) state in which it exhibits ideal gas behaviour. • T h e s t a n d a r d state for a pure liquid substance is (ordinarily) the pure liquid at the s t a n d a r d state pressure. • T h e standard state for a pure solid substance is (ordinarily) the pure solid at the s t a n d a r d state pressure.

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